docs: def popitem(self):
          """Remove a section from the parser and return it as
          a (section_name, section_proxy) tuple. If no section is present, raise
          KeyError.
  
          The section DEFAULT is never returned because it cannot be removed.
          """
          for key in self.sections():
              value = self[key]
              del self[key]
              return key, value
          raise KeyError